Refrigeration – Material cooling means including gas-liquid contactor – Fluid recirculating means
Patent
1988-10-28
1990-03-06
Bennett, Henry
Refrigeration
Material cooling means including gas-liquid contactor
Fluid recirculating means
62304, F28D 500
Patent
active
049054805
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to removal of excess liquid produced in devices of the type, wherein a liquid is pumped from a liquid to a location of use, the excess liquid being collected and removed periodically, especially for re-use. The invention is especially, but not exclusively, concerned with the removal of excess water produced in cooling devices having an air-permeable evaporation block which is continuously sprinkled with water and through which air flows continuously, the air being cooled, i.e. loosing heat by evaporating the water and excess water being collected for re-circulation An especially preferred field of use of the invention is in cooling units for cooling the supply air to the driving compartment in construction machinery and other mobile work places.
BACKGROUND OF THE INVENTION
In construction machinery and other vehicles serving as the work place of drivers and/or other operators the air conditioning has to be very efficient, especially during the warm season. Cooling units based on the use of halogenated hydrocarbons such as freon as the cooling agent, are today used in the majority of such work places. These units are often efficient and relatively compact in size, but they suffer from the severe drawback that this type of cooling agent is a danger to the environment, i.a. due to the unfavorourable effect on the ozon layer of the earth.
There is thus a great need of alternative cooling units using environment-positive cooling agents. A known alternative is to make use of the evaporation of water for cooling the supply air to the driving compartment in construction machinery, the air being passed through an evaporation block having an enlarged surface area and being charged with water, the water being evaporated in said block while cooling the air. Such surface-enlarged evaporation blocks are known per se, e.g. being formed by a lattice of moisture-resistent cardboard (e.g. CELDEK C-5090-15, available from Munthers Svenska Forsaljnings AB, Sollentuna, Sweden).
However, the known cooling units of this type have certain drawbacks and have only been used to a limited extent. As is obvious, they have a continuous demand of "cooling agent", i.e. of water to be evaporated, and the evaporation block normaly has to be kept supersaturated with water; in practice this means that excess water accumulates under the cooling unit. The previously known cooling devices have not solved the problem of handling the excess water in a satisfactory manner; this has i.a. resulted in a high water consumption, requiring oversized water tanks, and splashing of excess water into the driving compartment, especially when the vehicle slants when e.g. going downhill.
OBJECTS OF THE INVENTION
It is an object of the invention to provide for efficient removal of excess liquid, and reduced consumption of liquid, in devices of the type, in which a liquid is pumped from a liquid supply to a location of use and excess of the used liquid is collected and removed periodically, especially for re-use.
It is a special object of the invention to efficiently take care of the excess water in water-based cooling units and to prevent excess water from being carried with the cooled air to the location of use. It is another special object of the invention to make possible periodical re-use of the excess water using a special valve device, which is controlled automatically by the amount of excess water.
SUMMARY OF THE INVENTION
The special characteristics of the invention are indicated in the enclosed claims and will be further explained in the following description of preferred embodiments with reference to the enclosed drawings.
SHORT DESCRIPTION OF THE DRAWINGS
FIG. 1 is a top plan view of a first embodiment of a cooling unit according to the invention.
FIG. 2 is a sectional view taken along II--II in FIG. 1.
FIG. 3 is a sectional view of a first embodiment of a draining valve according to the invention shown in the closed position.
FIG. 4 is a view corresponding to FIG. 3 but with the draining val
ABL Alpin Produkter
Bennett Henry
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